[Improvement] add auto-complete for edit config

[shanshanying]

kbcli cluster edit-config mycluster --component mysql --config-spec xxx

When there are multiple config specs, one must specify the config template name.
But the name is hard to remeber, and it's better to support auto-completion.

[github-actions]

This issue has been marked as stale because it has been open for 30 days with no activity